发明名称 |
Releasing device in core barrel grapplers |
摘要 |
A device for disengaging a grappling device from a core barrel, which are lowered in an engaged or connected state into a hollow drill rod, is actuated by a recess made in the drill rod bore, when the barrel approaches or assumes a working position in the drill rod, and is thereby displaced by a spring for disengaging the mechanism connecting the grappling device and barrel.
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申请公布号 |
US4431225(A) |
申请公布日期 |
1984.02.14 |
申请号 |
US19810308529 |
申请日期 |
1981.10.05 |
申请人 |
CRAELIUS AB |
发明人 |
ERIKSSON, SUNE W.;EGNELOEV, GUNNAR K. |
分类号 |
E21B25/02;(IPC1-7):E21B31/12 |
主分类号 |
E21B25/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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